![]() We have successfully implemented the system in the laboratory environment and a glimpse of that is shown in figure 3. The laser beam is encoded with the desired phase by using a binary hologram and the decoding of the information is carried out with the help of a holographic modal wavefront sensor ( refer to Wavefront sensing of light beams). A block diagram representation of the scheme is demonstrated in figure 2. Presently we are developing an FSOC system that uses a set of orthogonal aberration modes (Zernike aberration modes) to encode the phase profile of a laser beam. Moreover, the introduction of the optical signal carrying optical angular momentum states as the encoded information further upgraded the FSOC system.įigure 2: Block diagram of a holographic wavefront sensor based free space optical communication system. Wavefront sensors are employed at the receiving station to compensate such effect. The real challenge in establishing an FSOC link through the atmosphere is the effect of the atmospheric turbulence, which may lead to loss of information carried by the optical signal. Free-space optics (FSO), also called free-space photonics (FSP), refers to the transmission of modulated visible or infrared ( IR ) beams through the. This, reduces the power consumption and cost while setting up an optical communication link. Free Space Optics communications, also called Free Space photonics (FSP). Further low divergence of the optical signal allows the use of smaller antenna at the receiving end, compared to that of the RF signals that require larger antenna due to its higher divergence. FSO uses LED or laser as a light source and the bandwidth required is up to. The high frequency of optical signals over the radio frequency (RF) signals enables the transfer of information in an optical communication system at a high data rate. (b) Installation is very easy and it takes less than. Thus, FSOC systems use a laser beam to carry the user information from a transmitting station to a receiving station through free space.Ĭommunication links can be established between satellites, satellites and airborne, underwater, ground-based and water surface based platforms and between platforms within the atmosphere. advantages of using Free-space optical communications : (a) Free space optics is a flexible network that delivers better speed than broadband. Canons Canobeam series used laser diodes (LDs) while Solecteks FSO series uses Light-Emitting Diodes (LEDs). Figure 1: Representation of a free space optical communication system.įree space optical communication (FSOC), as the name suggests is a communication link established through free space with the help of optical signals.
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